jrz126
Active Member
Now that summer is here, I have alittle more free time, so I think its time for a new project.
Many of you have seen my LED project for my car...https://www.cardomain.com/ride/435572/2
I'm looking to add even more LED's
Here's what I had in mind...hacking this led display thingy that I bought awhile back **broken link removed**, just using each bar for the convience of not having to make up my own housing for the LEDs. I'll replace them with Blue Leds, and mount them in various places throughout my car.
Now just turning on and staying on constant is too simple for me, I'd like a way to have them light up with the music. I'd like to make a simple interface to do this, possibly only having to run 2 wires to each bar. Then by changing the voltage sent to the bar, it will determine how many leds light up. (say I send +5V, 1 led lights, then I up it to 6V and 2 leds light. ect.)
I remeber doing something similar to this in my EE lab. What we did was placed a regular diode in with the LEDs and used the forward voltage drop of the diode to control the voltage at which each diode turns on.
Here's a schematic, the 1n4148s are my leds and R1-R8 are the current limiting resistors (values to be determined).
Does it sound like this will work?
oh yeah, my leds have a forward voltage of 3.5V and normal current of 20mA
Many of you have seen my LED project for my car...https://www.cardomain.com/ride/435572/2
I'm looking to add even more LED's
Here's what I had in mind...hacking this led display thingy that I bought awhile back **broken link removed**, just using each bar for the convience of not having to make up my own housing for the LEDs. I'll replace them with Blue Leds, and mount them in various places throughout my car.
Now just turning on and staying on constant is too simple for me, I'd like a way to have them light up with the music. I'd like to make a simple interface to do this, possibly only having to run 2 wires to each bar. Then by changing the voltage sent to the bar, it will determine how many leds light up. (say I send +5V, 1 led lights, then I up it to 6V and 2 leds light. ect.)
I remeber doing something similar to this in my EE lab. What we did was placed a regular diode in with the LEDs and used the forward voltage drop of the diode to control the voltage at which each diode turns on.
Here's a schematic, the 1n4148s are my leds and R1-R8 are the current limiting resistors (values to be determined).
Does it sound like this will work?
oh yeah, my leds have a forward voltage of 3.5V and normal current of 20mA